Mattress tub



FIG. 1 is a front, top perspective view of a mattress tub showing ournew design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The mattress tub is shown with symbolic breaks using dot-dashed, brokenlines. The appearance of any portion of the mattress tub between thedot-dashed, broken lines forms no part of the claimed design. The evenlyspaced, broken lines represent the portions of the mattress tub thatform no part of the claimed design.

CLAIM We claim the ornamental design for a mattress tub, as shown anddescribed.